https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91402
Bug ID: 91402
Summary: PowerPC unecessary -Wignored-attriubte warnings on
template specialization with -mlongcall
Product: gcc
Version: 7.4.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: andrewdkaster at gmail dot com
Target Milestone: ---
Host: x86_64-linux-gnu
Target: powerpc-linux-gnu
Build: x86_64-linux-gnu
Created attachment 46690
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46690&action=edit
Reproducer
When using the option -mlongcall for powerpc, g++ appears to treat my template
parameter for my template specialization as a function declaration and add the
longcall attribute, which then is later ignored and generates a warning.
~: powerpc-linux-gnu-g++ -mlongcall -Wall -Wextra -c test.cpp -o test.o
test.cpp:5:15: warning: ignoring attributes on template argument ‘R(A)’
[-Wignored-attributes]
struct S <R(A)> {};
^
test.cpp:11:18: warning: ignoring attributes on template argument ‘Ret(Arg)’
[-Wignored-attributes]
struct D<Ret(Arg)> {
^
I am using this class to wrap a generic delegate, per the second example.
Tested on Ubuntu 18.04.03, powerpc-linux-gnu-g++ version 7.4.0
~: powerpc-linux-gnu-g++ -v
Using built-in specs.
COLLECT_GCC=powerpc-linux-gnu-g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/powerpc-linux-gnu/7/lto-wrapper
Target: powerpc-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.4.0-1ubuntu1~18.04.1' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7 --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm
--disable-libquadmath --disable-libquadmath-support --enable-plugin
--with-system-zlib --enable-secureplt --disable-softfloat --with-cpu=default32
--disable-softfloat --enable-targets=powerpc-linux,powerpc64-linux
--enable-multiarch --disable-werror --with-long-double-128 --enable-multilib
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=powerpc-linux-gnu --program-prefix=powerpc-linux-gnu-
--includedir=/usr/powerpc-linux-gnu/include
Thread model: posix
gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
The same results happen when using a version of g++ 8.1 obtained from WindRiver
to target PowerPC VxWorks (running on Rhel-7):
./powerpc-linux-gnu-g++ -v
Reading specs from
/opt/workbench4-r2/compilers/gnu-8.1.0.1/x86_64-linux2/bin/../lib/gcc/powerpc-linux-gnu/8.1.0/../../../../powerpc-linux-gnu/lib/specs
COLLECT_GCC=./powerpc-linux-gnu-g++
COLLECT_LTO_WRAPPER=/opt/workbench4-r2/compilers/gnu-8.1.0.1/x86_64-linux2/bin/../libexec/gcc/powerpc-linux-gnu/8.1.0/lto-wrapper
Target: powerpc-linux-gnu
Configured with:
/folk/prj-llvm-build/gcc/build-storage/master/20190313_161647/wr-gcc/gcc/configure
--target=powerpc-linux-gnu --prefix=/usr/local/wind/tmp/compilers
--with-pkgversion='Wind River VxWorks GCC 8.1.0.1 - 2019.03.13' --disable-nls
--enable-languages=c,c++ --enable-targets=all --disable-multilib
--enable-threads --enable-tls --enable-__cxa_atexit --enable-secureplt
Thread model: posix
gcc version 8.1.0 (Wind River VxWorks GCC 8.1.0.1 - 2019.03.13)
